Astronomy:NGC 21

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Short description: Galaxy in the constellation Andromeda
NGC 21
NGC29 - SDSS DR14.jpg
NGC 21/NGC 29 (Sloan Digital Sky Survey)
Observation data (J 2000.0 epoch)
ConstellationAndromeda
Right ascension 00h 10m 46.9s[1]
Declination+33° 21′ 10″[1]
Redshift0.015911[1]
Helio radial velocity4770 ± 4 km/s[1]
Distance234 ± 29 Mly
(71.7 ± 8.9 Mpc)[2]
Apparent magnitude (V)+12.8
Absolute magnitude (V)-20.75[3]
Characteristics
TypeSAB(s)bc
Apparent size (V)1,2′ × 0,59′
Other designations
NGC 21, UGC 100, PGC 767.

NGC 21 (also known as NGC 29) is a spiral galaxy in the Andromeda constellation. It was discovered by William Herschel in 1790. Lewis Swift observed it again in 1885, leading to its double listing in the New General Catalogue.

NGC 21 in Infrared

References

External links